Bearing block contour

ABSTRACT

A railway coupler shank mounting comprises a pin extending through a pinhole of the shank and seated against a complementary cylindrical surface of a pin-bearing block which is seated against a complementary spherical surface of the shank defining the rear extremity of the pinhole. The block is recessed at the top and bottom of said spherical surface to prevent stress concentration on the shank at the upper and lower rear corners of the pinhole during extreme vertical angling of the coupler shank. Also the contour of the pinhole and block have been changed to minimize downward movement of the block from its normal and proper position during buffing forces on the coupler. Top and bottom edges (41 of FIG. 10) are made on a full radius (42) to reduce stress concentration in the rear corner areas under normal draft use and/or during angling up or down.

limited @taten Notant [72] Inventor Frederick C. lliulieke Tallmadge, 'Ohio [21] Appl. No. 857,124 [22] Filed Sept. l1, 1969 [45] Patented Get. 12, 19711 [73] Assignee Amstead industries Incorporated Chicago, lll.

[54] IBEAlltllNG BLOCK CONTOUIR 4 Claims, l0 Drawing Figs.

[52] 111.8. C1 213/69, 213/64 [51] lntl 611g9/0ll, B61g 9/20 [50] Field oil' Search 213/62, 64, 67, 69

[56] References Cited UNITED STATES PATENTS 2,889,939 6/1959 Metzger 213/64 2,889,940 6/1959 Metzger 213/69 i111 mailman 2,973,103 2/1961 Tack 213/64 3,017,038 l/l962 Cope et al 213/64 3,123,226 3/1964 Kuleke 213/64 Primary Examiner-Drayton E. Hoffman Attorney-Walter L` Schlegel, Jr.

ABSTRACT: A railway coupler shank mounting comprises a pin extending through a pinhole of the shank and seated against a complementary cylindrical surface of a pin-bearing block which is seated against a complementary spherical surface of the shank defining the rear extremity of the pinhole. The block is recessed at the top and bottom of said spherical surface to prevent stress concentration on the shank at the upper and lower rear corners of the pinhole during extreme vertical angling of the coupler shank. Also the contour ofthe pinhole and block have been changed to minimize downward movement of the block from its normal and proper position during bufng forces on the coupler. Top and bottom edges (411 of FIG. 110) are made on a full radius (42) to reduce stress concentration in the rear corner areas under normal draft use and/or during angling up or down.

PATENTED mm1 2 i911 SHEET E UF 2 3,bl2,29b

MIEAIIIIIIIG HILGCIII ICON'IIGIUR 'Ihis invention relates to a railway coupler shank mounting wherein a coupler shank comprises a pinhole receiving a pivot pin bearing block in spherical face engagement with the shank and in cylindrical face engagement with the pin to accommodate vertical and horizontal angling of the shank.

A primary object of the invention is to recess the top and bottom of the block along its spherical couplershank-engag ing surface to prevent stress concentrations at the lower and upper rear corners of the coupler shank pinhole during upward and downward angling of the shank, respectively.

Another object of the invention is to minimize downward shifting of the block from its normal position when the coupler shank is urged against the pin under buffing forces.

The foregoing and other objects and advantages of the invention will become apparent from the following specification and the accompanying drawings, whereini FIG. I is a central vertical sectional view through a railway coupler shank mounting embodying the invention;

FIG. 2 is a view corresponding to FIG. I but showing the coupler shank angled upwardly;

FIG. 3 is a view corresponding to FIG. ll but showing the coupler shank angled downwardly;

FIG. d is a view corresponding to FIG. I but showing the novel pin-bearing block thereof in assembly with a prior art coupler shank;

FIG. 5 is a view corresponding to FIG. AI but showing the prior art coupler shank angled upwardly;

FIG. ti is a view corresponding to FIG. I but showing the prior art coupler shank angled downwardly;

FIG. 7 is a side elevational view of the novel pin-bearing block;

FIG. d is atop plan view of the block;

FIG. Il is a side elevational view of the novel coupler shank shown in FIG. I; and

FIG. I@ is a top plan view partly in section along the horizontal median plane of the novel coupler shank as indicated by line Ill-III of FIG. 9.

Describing the invention in detail and referring first to FIG. il, the novel coupler shank I2 comprises a pinhole 114i for reception of a substantially cylindrical pivot pin I6 also received in complementary pinholes I3 of a conventional yoke 2d.

The top of the yoke is engageable with a conventional yoke guide wearplate 22, and the bottom of the pin I6 rests on a conventional yoke support plate 2li, the plates 22 and 2d being attached ro a car body in well-known manner.

A novel block 26 comprises a spherical face 27 seated against a complementary surface 23 of the coupler shank I2 defining the rear extremity of its pinhole Id. The block 26 engages the pin along a complementary cylindrical surface or area 29 of the block to accommodate horizontal angling of the coupler, and the surface 27 of the block is recessed as at 30, 3f) so that upon upward angling of the coupler shank (FIG. 2) stresses are not concentrated at the shank surface 28 at the lower corner of said surface 23 defining the lower rear edge of pinhole Id, and similarly upon downward angling of the coupler shank (FIG. 3) stresses are not imparted to the upper corner of surface 23 defining the upper rear edge of pinhole Id.

Referring now to FIGS. 7 and 3, the novel pin-bearing block 2d is shown in detail and the prior art contour of surface 27 is shown by phantom lines at 32, 32 in FIG. 7. Another feature of the novel block is that the top and bottom lips or collars 3d and 3o thereof are spaced from the lateral sides or edges 37 of the block 2o and are formed on a l 15/ l6inch radius indicated at 39 (FIG. II) to accommodate tilting thereof relative to the coupler shank in its pinhole Iii as shown in FIGS. 2 and 3. The prior art contour of these lips or collars 3d and 36 are shown in phantom lines at 39a matching the contour of prior art shank surfaces dfi (FIG. III).

Opposite sides 37 of the block 2o d are provided with spring holes 33, each hole being adapted to receive a coil spring (not shown) compressed against a recessed surface 40 (FIGS. 9 and III) in the coupler shank I2 at one side of its pinhole 11d.

FIG. III also shows that surfaces dll are formed on a l l5/l6-inch radius (I2 struck from a point Ml on the vertical median plane y--y of the shank I2 rearwardly of the vertical median plane X-X of the pinhole Id. The prior art contour of each surface II is shown at do formed on a radius struck from point SII on plane Y-Y forwardly of plane X-X. Surfaces AII better distribute stresses instead of concentrating stress in relatively sharp corners do of prior art.

Referring now to FIGS. 9 and llfl it will be seen that the surface 52 defining the forward extremity of pinhole Id is V- shaped in vertical cross section with the apex of the V being formed on a l l5/l6-inch radius 54 (FIG. 1li) struck from a point 56 at the intersection of plane X-X, plane Y-Y, and plane III-III shown in FIG. 9. The prior art contour of surface 52 is shown in phantom lines at 53 in FIG. 9.

Thus it will be understood that the novel pinhole III greatly reduces any tendency of the block to slide downwardly from its normal position shown in FIGS. ll-3, particularly under buffing conditions (not shown) wherein the apex of surface 52 engages the pin llo. It will also be understood that in prior art arrangements wherein the block did move downwardly from normal position very undesirable high stresses were imparted to the block and shank.

The butt end of the shank 112 comprises a spherical surface of) adapted to seal against a complementary front draft gear follower (not shown) carried within the yoke 20 in the usual manner.

FIGS. I-3 show the novel block 2b assembled within a pinhole Il of a novel coupler shank shown in FIGS. 9 and lll). FIGS. 2 and 3 show respectively the extreme upward angled position and the extreme downward angled position of the coupler shank I2. FIG. 2 shows that lower recess 34D prevents stress concentration at the lower rear comer of pinhole IIA under these conditions, and FIG. 3 shows that upper recess 3d prevents stress concentrations at the upper rear edge of the pinhole under the conditions of FIG. 3.

Referring now to FIGS. 4I-o the novel block 26 is shown assembled in a pinhole Id of a prior art coupler shank I2 having the prior art bearing surfaces 436 and 5d.

FIGS. 5 and o show respectively the extreme upward angled position and the extreme downward angled position of the coupler shank I2. FIG. 5 illustrates that lower recess 30 prevents stress concentration at the lower rear comer of pinhole III under those conditions even though the block surface 27 has partially lifted off the shank surface 23. Similarly referring to FIG. d it will be seen that in the extreme downward angled position of the coupler shank I2, the upper recess 30 eliminates stress concentration at the upper rear edge of pinhole Id even though block surface 27 has lifted off the lower portion of surface 28.

What is claimed is:

I. A railway coupler shank having a pinhole partly defined by a substantially spherical pin-bearing-bloclr-engaging surface, the top and bottom of said surface being bounded by spaced substantially cylindrical top and bottom pin-bearing block-engaging surfaces, each of said top and bottom surfaces being formed on a radius struck from a point rearwardly of the transverse vertical centerplane of said pinhole to equalize and distribute stress.

2. A railway coupler shank according to claim I wherein said radius is approximately l 15/16 of an inch in length to reduce or eliminate stress concentration.

3. A railway coupler shank according to claim I wherein the front of said pinhole is defined by a cylindrical surface which is V-shaped in vertical cross section, the apex of said v being formed on a radius struck from said centerplane, said radius being approximately l l5/l6-inches in length.

A railway coupler shank having a pinhole partly defined by a cylindrical front surface which is V-shaped as seen in vertical sectional view and has the apex of said V at substantially the horizontal median plane of the shank, said apex being abutments above and below said rear surface and each formed in horizontal curvature on a substantially l 15/16-inch radius struck from a point on substantially the longitudinal vertical median plane of the shank rearwardly of said transverse plane. 

1. A railway coupler shank having a pinhole partly defined by a substantially spherical pin-bearing-block-engaging surface, the top and bottom of said surface being bounded by spaced substantially cylindrical top and bottom pin-bearing blockengaging surfaces, each of said top and bottom surfaces being formed on a radius struck from a point rearwardly of the transverse vertical centerplane of said pinhole to equalize and distribute stress.
 2. A railway coupler shank according to claim 1 wherein said radius is approximately 1 15/16 of an inch in length to reduce or eliminate stress concentration.
 3. A railway coupler shank according to claim 1 wherein the front of said pinhole is defined by a cylindrical surface which is V-shaped in vertical cross section, the apex of said v being formed on a radius struck from said centerplane, said radius being approximately 1 15/16-inches in length.
 4. A railway coupler shank having a pinhole partly defined by a cylindrical front surface which is V-shaped as seen in vertical sectional view and has the apex of said V at substantially the horizontal median plane of the shank, said apex being formed on a substantially 1 15/16-inch radius struck substantially from a point on the transverse vertical median plane of said hole at its intersection with the horizontal median plane of the shank, a rear surface which is substantially spherical defining the rear extremity of the hole and top and bottom abutments above and below said rear surface and each formed in horizontal curvature on a substantially 1 15/16-inch radius struck from a point on substantially the longitudinal vertical median plane of the shank rearwardly of said transverse plane. 